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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Administrative data

Link to relevant study record(s)

Description of key information

The dissociation constants of boron orthophosphate were estimated on the basis of literature values for phosphoric acid. 
Literature values of pka at 25°C:

Key value for chemical safety assessment

Additional information


 No. pKa  Temperature (°C)
 #1  2.16  25
 #2  7.21  25
 #3  12.32  25